Document Type and Number:
Japanese Patent JPS5742352
Kind Code:
B2
Abstract:
A pack of stitch-pattern cams provides a plurality of selectable stitch patterns. A cam follower is shiftable along the length of the cam pack, to different selected ones of the pattern cams. The force used to shift the cam follower is manually applied, using a cam selector knob on the exterior of the sewing machine. The selector knob is responsive to the touch of the user's hand, providing a touch-responsive signal which causes an electromagnet to automatically move the cam follower from an engaged to a disengaged position, so that the user can manually shift the follower. When the user lets go of the selector knob, the disappearance of the touch-responsive signal deenergizes the electromagnet and the follower returns to engaged position. A time-delay action is provided, so that the cam follower not move to disengaged position in response to mere inadvertent touching of the selector knob by the user. Likewise, a time-delay action is provided such that the follower not move back to engaged position until the user's hand has been removed from the selector knob for a predetermined short interval, to provide for the case that the user, during the course of a manual change of cam-follower setting, briefly remove her hand from the knob for whatever reason.
Application Number:
JP8559377A
Publication Date:
September 08, 1982
Filing Date:
July 19, 1977
Export Citation:
International Classes:
D05B3/02; D05B19/02; G05B19/10